Pathogenicity of Paecilomyces fumosaroseus (Wise) Brown & Smith, Beauveria bassiana (Bals.) Vuill. and Metarhizium anisopliae (Metsch.) Sorokin on the striped flea beetle Phyllotreta striolata F. (Coleoptera: Chrysomelidae)
2004
Y.B. Ibrahim | T.P.Priyatno
The ability of three species of entomopathogenic fungi, Paecilomyces fumosoroseus (Wise) Broum & Smith,Beauveria bassiana (Bals.) Vuill. and Metarhizium anisopliae (Metsch.) Sorokin to cause infection on theadults, eggs and larvae of the striped flea beetle Phyllotreta striolata F. was tested. Only one isolate of M.anisopliae and none of the B. bassiana and P. fumosoroseus caused adult mortality in excess of 50% at aconcentration of 2 x 107 conidia mL-1. One isolate of P. fumosoroseus (Pf), one B. bassiana (Wls) and twoof M. anisopliae (MPs and Cy3) were pathogenic to the first instar larvae of P. striolata causing more than50% mortality at a concentration of 2 x 106 conidia mL-1. The rate of larval mortality increased with increasein conidia concentration. The respective estimated LTW values for Pf, Wls, MPs and Cy3 for the larvae at 2 x106 conidia mL-1 were 2.9> 3.5, 3.0 and 3.0 days. The two isolates of M. anisopliae were also highly pathogenicto the eggs causing significant inhibition of hatching, while B. bassiana and P. fumosoroseus were less pathogenic.Estimates of the median lethal concentration for Cy3 and MPs were 13.0 x Iff and 5.03 x 105 conidia mL-1respectively.
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